Update the used Flutter version to 3.16.0 and all Flutter packages to
their latest version.
This commit also fixes all of the newly added analysis options and the
layout changes introduced with the new Flutter version (e.g. we have to
set the "tabAlignment" property in the "TabBar" widget).
This commit improves the handling of tabs in the samll deck layout. We
are now saving the selected tabs index in the newly added
"LayoutRepository" so that we can reuse the selected tab when a user
switches between the small and large layout. We can now also set the tab
which should be initially selected in the large layout when a user
selects a column in the navigation rail. Last but not least we can also
reset the initial tab index when a user selects a new deck in the
settings, so that we always display the first column instead of the
column with the same index as it was selected in the previous deck.
